The American Bulldog descends from working bulldogs that settlers brought to the colonial South, where they caught loose cattle and feral hogs and guarded farmsteads. The type nearly vanished after World War II until John D. Johnson and later Alan Scott revived it. Today there are two broad types: the leaner, more athletic Scott or standard type, and the heavier, shorter-muzzled Johnson or bully type. Many dogs are a blend of both.
Most are mostly white, short-coated and moderate shedders, with a confident, protective streak and a deep attachment to their people. Because Metro Nashville treats dogs by behavior rather than breed, the work falls on the owner: early socialization, reward-based training and secure handling. Many dogs listed as American Bulldogs are mixes, so size and energy can vary quite a bit.